Assessment of Thermo-Structural Effects on EHL Piston Skirt Lubrication
Assessment of Thermo-Structural Effects on EHL Piston Skirt Lubrication
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EHL 活塞裙润滑的热结构效应评估
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. Theodossiades
中科院分区：
文献类型：
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作者：
B. Littlefair;S. Howell;H. Rahnejat;S. Theodossiades
由于不同的工作温度和力，活塞裙和气缸孔表面的原位轮廓会受到热弹性整体变形的影响。在操作中，润滑膜被夹带到这些型材之间的间隙中并在其中加压。该薄膜不仅支撑主要的接触载荷，而且抑制表面的直接相互作用，从而减少摩擦，从而提高燃油效率。多年来，赛车运动应用中的往复运动质量已经通过使用部分圆周裙边来实现。形状对机械和结构载荷的响应与经典的全圆周裙部研究不同。本文提供了活塞裙如何支撑固有活塞侧向载荷的“快照”。它强调了工作温度对裙部轮廓、连接间隙和润滑油膜的重要性。此外，它还显示了给定活塞裙形状及其结构刚度在操作中的表现。版权所有 © 2012 ASME
The in situ profiles of the piston skirt and cylinder bore surface are subject to thermo-elastic global deformation due to differential operating temperatures and forces. In operation, a lubricant film is entrained into and pressurized within the gap between these profiles. This film not only supports the prevailing contact load, but also inhibits direct interaction of surfaces, thus reducing friction and thereby improving fuel efficiency. The reduction of reciprocating mass in motorsport applications has been achieved through the use of partial circumferential skirts for a number of years now. The response of the shape to both mechanical and structural loadings differs from the classic full circumferential skirt studies. This paper provides a ‘snapshot’ into how the inherent piston side load is supported by the piston skirt. It highlights the importance of the operational temperature on the skirt profile, conjunctional gap and the lubricant film. Additionally, it shows how a given piston skirt shape and its structural stiffness perform in operation.Copyright © 2012 by ASME